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What is a Supermoon? | National Geographic

What is a supermoon? Find out what makes the moon appear extra big and bright, how it effects the tides, and how the phenomenon got its name.
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National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.